@@ -296,4 +296,13 @@ config MEDIA_TUNER_QM1D1B0004
default m if !MEDIA_SUBDRV_AUTOSELECT
help
Sharp QM1D1B0004 ISDB-S tuner driver.
+
+config MEDIA_TUNER_DVB_DUMMY_TUNER
+ tristate "Dummy DVB Media Tuner"
+ depends on MEDIA_SUPPORT && I2C
+ help
+ Dummy DVB media tuner driver
+ The virtual DVB test driver serves as a reference DVB driver and helps
+ validate the existing APIs in the media subsystem. It can also aid
+ developers working on userspace applications.
endmenu
@@ -44,5 +44,6 @@ obj-$(CONFIG_MEDIA_TUNER_QM1D1C0042) += qm1d1c0042.o
obj-$(CONFIG_MEDIA_TUNER_QM1D1B0004) += qm1d1b0004.o
obj-$(CONFIG_MEDIA_TUNER_M88RS6000T) += m88rs6000t.o
obj-$(CONFIG_MEDIA_TUNER_TDA18250) += tda18250.o
+obj-$(CONFIG_MEDIA_TUNER_DVB_DUMMY_TUNER) += dvb_dummy_tuner.o
ccflags-y += -I$(srctree)/drivers/media/dvb-frontends
new file mode 100644
@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020 Daniel W. S. Almeida <dwlsalmeida@gmail.com>
+ *
+ * The virtual DVB test driver serves as a reference DVB driver and helps
+ * validate the existing APIs in the media subsystem. It can also aid
+ * developers working on userspace applications.
+ *
+ * This dummy tuner should support common TV standards such as
+ * DVB-T/T2/S/S2, ISDB-T and ATSC when completed.
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <media/dvb_frontend.h>
+
+struct dvb_dummy_tuner_config {
+ struct dvb_frontend *fe;
+ u32 mock_power_up_delay_msec;
+ u32 mock_tune_delay_msec;
+ u32 mock_sleep_delay_msec;
+ u32 mock_resume_delay_msec;
+ u32 dummy_valid_dvb_t_frequencies[8];
+ u32 dummy_valid_dvb_c_frequencies[8];
+ u32 dummy_valid_dvb_s_frequencies[8];
+ u8 max_frequency_shift_hz;
+};
+
+struct dvb_dummy_tuner_cnr_to_qual_s {
+ /* attempt to use the same values as libdvbv5 */
+ u32 modulation;
+ u32 fec;
+ u32 cnr_ok, cnr_good;
+};
+
+struct dvb_dummy_tuner_cnr_to_qual_s dvb_c_cnr_2_qual[] = {
+ /* from libdvbv5 source code */
+ { QAM_256, FEC_NONE, 34., 38.},
+ { QAM_64, FEC_NONE, 30., 34.},
+};
+
+struct dvb_dummy_tuner_cnr_to_qual_s dvb_s_cnr_2_qual[] = {
+ /* from libdvbv5 source code */
+ { QPSK, FEC_1_2, 7., 10.},
+
+ { QPSK, FEC_2_3, 9., 12.},
+ { QPSK, FEC_3_4, 10., 13.},
+ { QPSK, FEC_5_6, 11., 14.},
+
+ { QPSK, FEC_7_8, 12., 15.},
+};
+
+struct dvb_dummy_tuner_cnr_to_qual_s dvb_s2_cnr_2_qual[] = {
+ /* from libdvbv5 source code */
+ { QPSK, FEC_1_2, 9., 12.},
+ { QPSK, FEC_2_3, 11., 14.},
+ { QPSK, FEC_3_4, 12., 15.},
+ { QPSK, FEC_5_6, 12., 15.},
+ { QPSK, FEC_8_9, 13., 16.},
+ { QPSK, FEC_9_10, 13.5, 16.5},
+ { PSK_8, FEC_2_3, 14.5, 17.5},
+ { PSK_8, FEC_3_4, 16., 19.},
+ { PSK_8, FEC_5_6, 17.5, 20.5},
+ { PSK_8, FEC_8_9, 19., 22.},
+};
+
+static struct dvb_dummy_tuner_cnr_to_qual_s dvb_t_cnr_2_qual[] = {
+ /* from libdvbv5 source code */
+ { QPSK, FEC_1_2, 4.1, 5.9},
+ { QPSK, FEC_2_3, 6.1, 9.6},
+ { QPSK, FEC_3_4, 7.2, 12.4},
+ { QPSK, FEC_5_6, 8.5, 15.6},
+ { QPSK, FEC_7_8, 9.2, 17.5},
+
+ { QAM_16, FEC_1_2, 9.8, 11.8},
+ { QAM_16, FEC_2_3, 12.1, 15.3},
+ { QAM_16, FEC_3_4, 13.4, 18.1},
+ { QAM_16, FEC_5_6, 14.8, 21.3},
+ { QAM_16, FEC_7_8, 15.7, 23.6},
+
+ { QAM_64, FEC_1_2, 14.0, 16.0},
+ { QAM_64, FEC_2_3, 19.9, 25.4},
+ { QAM_64, FEC_3_4, 24.9, 27.9},
+ { QAM_64, FEC_5_6, 21.3, 23.3},
+ { QAM_64, FEC_7_8, 22.0, 24.0},
+};
+
+enum dvb_dummy_tuner_lock_status {
+ STATUS_NO_LOCK = 0,
+ STATUS_LOCKED = TUNER_STATUS_LOCKED,
+};
+
+enum dvb_dummy_tuner_power_status {
+ STATUS_UNKNOWN,
+ STATUS_ASLEEP,
+ STATUS_ACTIVE
+};
+
+enum dvb_dummy_tuner_frequency_shift_status {
+ EXACT_MATCH,
+ CLOSE_MATCH,
+ TOO_FAR_OFF
+};
+
+struct dvb_dummy_tuner_hardware_state {
+ enum dvb_dummy_tuner_power_status power_status;
+ enum dvb_dummy_tuner_lock_status lock_status;
+ u32 if_frequency;
+ u32 tuned_frequency;
+ u32 bandwidth;
+};
+
+struct dvb_dummy_tuner_dev {
+ struct dvb_frontend *fe;
+ struct dvb_dummy_tuner_hardware_state hw_state;
+ struct dvb_dummy_tuner_config config;
+};
+
+static struct dvb_dummy_tuner_dev*
+dvb_dummy_tuner_get_dev(struct dvb_frontend *fe)
+{
+ struct i2c_client *client = fe->tuner_priv;
+
+ return (struct dvb_dummy_tuner_dev *)i2c_get_clientdata(client);
+}
+
+static bool dvb_dummy_tuner_check_frequency_shift(struct dvb_frontend *fe)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct dvb_dummy_tuner_config config = tuner_dev->config;
+ u32 *valid_frequencies = NULL;
+ u32 array_sz = 0;
+ u32 i;
+
+ switch (c->delivery_system) {
+ case SYS_DVBT:
+ case SYS_DVBT2:
+ valid_frequencies =
+ config.dummy_valid_dvb_t_frequencies;
+ array_sz = ARRAY_SIZE(config.dummy_valid_dvb_t_frequencies);
+ break;
+ case SYS_DVBS:
+ case SYS_DVBS2:
+ valid_frequencies =
+ config.dummy_valid_dvb_s_frequencies;
+ array_sz = ARRAY_SIZE(config.dummy_valid_dvb_s_frequencies);
+ break;
+ case SYS_DVBC_ANNEX_A:
+ valid_frequencies =
+ config.dummy_valid_dvb_c_frequencies;
+ array_sz = ARRAY_SIZE(config.dummy_valid_dvb_c_frequencies);
+ break;
+
+ default:
+ pr_warn("%s: unsupported delivery system: %u\n",
+ __func__,
+ c->delivery_system);
+ break;
+ }
+
+ for (i = 0; i < array_sz; i++) {
+ if (c->frequency == valid_frequencies[i])
+ return EXACT_MATCH;
+ else if (c->frequency >= valid_frequencies[i] -
+ config.max_frequency_shift_hz &&
+ c->frequency <= valid_frequencies[i] +
+ config.max_frequency_shift_hz)
+ return CLOSE_MATCH;
+ }
+
+ return TOO_FAR_OFF;
+}
+
+static int
+dvb_dummy_tuner_get_signal_strength(struct dvb_frontend *fe, u16 *strength)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct dvb_dummy_tuner_cnr_to_qual_s *cnr2qual = NULL;
+ u32 array_size = 0;
+ enum dvb_dummy_tuner_frequency_shift_status shift_status;
+ u32 i;
+
+ shift_status = dvb_dummy_tuner_check_frequency_shift(fe);
+
+ switch (c->delivery_system) {
+ case SYS_DVBT:
+ case SYS_DVBT2:
+ cnr2qual = dvb_t_cnr_2_qual;
+ array_size = ARRAY_SIZE(dvb_t_cnr_2_qual);
+ break;
+
+ case SYS_DVBS:
+ cnr2qual = dvb_s_cnr_2_qual;
+ array_size = ARRAY_SIZE(dvb_s_cnr_2_qual);
+ break;
+
+ case SYS_DVBS2:
+ cnr2qual = dvb_s2_cnr_2_qual;
+ array_size = ARRAY_SIZE(dvb_s2_cnr_2_qual);
+ break;
+
+ case SYS_DVBC_ANNEX_A:
+ cnr2qual = dvb_c_cnr_2_qual;
+ array_size = ARRAY_SIZE(dvb_c_cnr_2_qual);
+ break;
+
+ default:
+ pr_warn("%s: unsupported delivery system: %u\n",
+ __func__,
+ c->delivery_system);
+ return -EINVAL;
+ }
+
+ for (i = 0; i <= array_size; i++) {
+ if (cnr2qual[i].modulation == c->modulation &&
+ cnr2qual[i].fec == c->fec_inner) {
+ *strength = (shift_status == EXACT_MATCH) ?
+ cnr2qual[i].cnr_good :
+ (shift_status == CLOSE_MATCH) ?
+ cnr2qual[i].cnr_ok :
+ cnr2qual[i].cnr_ok -
+ (cnr2qual[i].cnr_good - cnr2qual[i].cnr_ok);
+ return 0;
+ }
+
+ }
+
+ /* default to some random values if we can't match against the table */
+ *strength = (shift_status == EXACT_MATCH) ? 34 : 10;
+ return 0;
+}
+
+static int dvb_dummy_tuner_init(struct dvb_frontend *fe)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+ struct dvb_dummy_tuner_config config = tuner_dev->config;
+
+ msleep_interruptible(config.mock_power_up_delay_msec);
+
+ tuner_dev->hw_state.power_status = STATUS_ACTIVE;
+ tuner_dev->hw_state.if_frequency = 5000;
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_sleep(struct dvb_frontend *fe)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+ struct dvb_dummy_tuner_config config = tuner_dev->config;
+
+ msleep_interruptible(config.mock_sleep_delay_msec);
+ tuner_dev->hw_state.power_status = STATUS_ASLEEP;
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_suspend(struct dvb_frontend *fe)
+{
+ return dvb_dummy_tuner_sleep(fe);
+}
+
+static int dvb_dummy_tuner_resume(struct dvb_frontend *fe)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+ struct dvb_dummy_tuner_config config = tuner_dev->config;
+
+ msleep_interruptible(config.mock_resume_delay_msec);
+ tuner_dev->hw_state.power_status = STATUS_ACTIVE;
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_set_params(struct dvb_frontend *fe)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+ struct dvb_dummy_tuner_config config = tuner_dev->config;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ u32 min_freq = fe->ops.tuner_ops.info.frequency_min_hz;
+ u32 max_freq = fe->ops.tuner_ops.info.frequency_max_hz;
+ u32 min_bw = fe->ops.tuner_ops.info.bandwidth_min;
+ u32 max_bw = fe->ops.tuner_ops.info.bandwidth_max;
+
+ msleep_interruptible(config.mock_tune_delay_msec);
+
+ if (c->frequency < min_freq || c->frequency > max_freq ||
+ c->bandwidth_hz < min_bw || c->bandwidth_hz > max_bw) {
+ tuner_dev->hw_state.lock_status = STATUS_NO_LOCK;
+ return -EINVAL;
+ }
+
+ tuner_dev->hw_state.tuned_frequency = c->frequency;
+ tuner_dev->hw_state.bandwidth = c->bandwidth_hz;
+ tuner_dev->hw_state.lock_status = STATUS_LOCKED;
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_set_config(struct dvb_frontend *fe,
+ void *priv_cfg)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+
+ WARN_ON(sizeof(tuner_dev->config) != sizeof(*priv_cfg));
+ memcpy(&tuner_dev->config, priv_cfg, sizeof(*priv_cfg));
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_get_frequency(struct dvb_frontend *fe,
+ u32 *frequency)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+
+ *frequency = tuner_dev->hw_state.tuned_frequency;
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_get_bandwidth(struct dvb_frontend *fe,
+ u32 *bandwidth)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+
+ *bandwidth = tuner_dev->hw_state.bandwidth;
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_get_if_frequency(struct dvb_frontend *fe,
+ u32 *frequency)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+
+ *frequency = tuner_dev->hw_state.if_frequency;
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_get_status(struct dvb_frontend *fe, u32 *status)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = dvb_dummy_tuner_get_dev(fe);
+
+ *status = tuner_dev->hw_state.lock_status;
+
+ return 0;
+}
+
+static const struct dvb_tuner_ops dvb_dummy_tuner_ops = {
+ .init = dvb_dummy_tuner_init,
+ .sleep = dvb_dummy_tuner_sleep,
+ .suspend = dvb_dummy_tuner_suspend,
+ .resume = dvb_dummy_tuner_resume,
+ .set_params = dvb_dummy_tuner_set_params,
+ .set_config = dvb_dummy_tuner_set_config,
+ .get_bandwidth = dvb_dummy_tuner_get_bandwidth,
+ .get_frequency = dvb_dummy_tuner_get_frequency,
+ .get_if_frequency = dvb_dummy_tuner_get_if_frequency,
+ .get_status = dvb_dummy_tuner_get_status,
+ .get_rf_strength = dvb_dummy_tuner_get_signal_strength
+};
+
+static const struct i2c_device_id dvb_dummy_tuner_i2c_id_table[] = {
+ {"dvb_dummy_tuner", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, dvb_dummy_tuner_i2c_id_table);
+
+static int dvb_dummy_tuner_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct dvb_dummy_tuner_config *config = client->dev.platform_data;
+ struct dvb_frontend *fe = config->fe;
+ struct dvb_dummy_tuner_dev *tuner_dev = NULL;
+
+ tuner_dev = kzalloc(sizeof(*tuner_dev), GFP_KERNEL);
+ if (!tuner_dev)
+ return -ENOMEM;
+
+ tuner_dev->fe = config->fe;
+ i2c_set_clientdata(client, tuner_dev);
+
+ memcpy(&fe->ops.tuner_ops,
+ &dvb_dummy_tuner_ops,
+ sizeof(struct dvb_tuner_ops));
+
+ fe->tuner_priv = client;
+
+ return 0;
+}
+
+static int dvb_dummy_tuner_i2c_remove(struct i2c_client *client)
+{
+ struct dvb_dummy_tuner_dev *tuner_dev = i2c_get_clientdata(client);
+ struct dvb_frontend *fe = tuner_dev->fe;
+
+ memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
+ fe->tuner_priv = NULL;
+ kfree(tuner_dev);
+
+ return 0;
+}
+
+static struct i2c_driver dvb_dummy_tuner_i2c_driver = {
+ .driver = {
+ .name = "dvb_dummy_tuner",
+ .suppress_bind_attrs = true,
+ },
+ .probe = dvb_dummy_tuner_i2c_probe,
+ .remove = dvb_dummy_tuner_i2c_remove,
+ .id_table = dvb_dummy_tuner_i2c_id_table,
+};
+module_i2c_driver(dvb_dummy_tuner_i2c_driver);
+
+MODULE_DESCRIPTION("DVB Dummy Tuner");
+MODULE_AUTHOR("Daniel W. S. Almeida");
+MODULE_LICENSE("GPL");